@ikoz , @fave, @Valarayys - than you for the education

only need an android like the UI with the main utilities + debian linux base - the device will run a single app (.net blazor hybrid) - both are good suggestions - will explore that -
Debian+Mobile DE would be ideal - unfortunately not that literate to know how to go about it in a way that we can create and deploy in production and maintain/update it in a consistent way.

Hello , keen to know if we can possibly use Ubuntu touch in production environments for IoT use cases.

It would be ideal if we can use Ubuntu Touch. Our boards are generic, with one based on RPi CM4 and another based on Rockchip 35xx (3566/68).

Our main requirements is a simple UI for basic navigation and settings. We do not use voice or any of the mobile phone related usage. Currently Debian with XFCE works, but it is clumsy to use.

It would be great if someone can point me to docs and other relating information to help us start porting for RPi CM4.

Any help would be much appreciated.